SQLite database retrieval. Cant match strings [duplicate]

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• How do I compare strings in Java? 23 answers

This is my code to check if the user has already registered. It checks if the same username password pair has been stored in the database. Even though I can see with the toast that's such a combination is their, I am always return "not found". What seems to be the problem here?

public String login(String user, String pass) {
            // TODO Auto-generated method stub
            int i=0;
            String[] columns = new String[]{KEY_NAME, KEY_USERN, KEY_PASS, KEY_EMAIL, KEY_CONT, KEY_EMER};
            Cursor c = ourDatabase.query(DATABASE_USER, columns, null, null, null, null, null);
            String res = "";
            int iQ1=c.getColumnIndex(KEY_USERN);
            int iQ2=c.getColumnIndex(KEY_PASS);
            Toast.makeText(ourContext, "1st"+user+pass, Toast.LENGTH_LONG).show();
            for(c.moveToFirst();!c.isAfterLast();c.moveToNext())
            {
                Toast.makeText(ourContext, "\'"+user+"\'"+c.getString(iQ1)+"\'"+pass+"\'"+c.getString(iQ2), Toast.LENGTH_LONG).show();
                if(c.getString(iQ2)==pass)
                {

                    Toast.makeText(ourContext,      c.getString(iQ1)+c.getString(iQ2), Toast.LENGTH_LONG).show();
                    return "found";
                }
                return "not found";

            }   

            return "not found";
        }